1. Wash the bought black beans with clear water, gently rub them with your hands, then put them aside to dry, and control the excess water to dry.

2. Bring the pot to a big fire, then add the dried black beans, stir-fry slowly over medium heat until the black bean skin cracks, then stir-fry over low heat, then close the pot and take out the beans to cool.

3. Prepare a glass container, put the beans in it, then put the fried beans in a glass bottle and add vinegar. This way, the vinegar can just submerge the black beans, then seal the glass bottle, and then put it in the normal temperature environment, or put it in the refrigerator for refrigeration. It can be made after 7 days, adding seasoning according to your own taste.